Screen



H. F. WULLSTEIN.

SCREEN.

APPLICATION FILED FEB. 13, 1919.

1,334,579. Patented Mar. 23, 1920.

2 $HEETSSHEET I.

. Moe/"ego UNITED srarrns PATENT ormon.

HERMAN F. RVULLS'IEIN, OF SALT LAKE CITY, U'IAI-I.

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To all whom it may concern Be it known that I, HERMAN F. VVULL- STEIN, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Screens; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make rangement of 'bars whereby the lower ends of the latter may be spaced apart (listances greater than their upper ends, and at the same time permit bars of uniform diameter throughout their lengths to be used.

Yet another object is to provide novel means for mounting the screening bars in the frame.

With the foregoing objects in view, the invention resides in certain novel features of construction and the unique association of parts hereinafter fully described and claimed, reference being made to the accompanying drawings.

Figure 1 is a central vertical longitudinal section of the screen.

Fig. 2 is a vertical transverse section on the plane indicated by the line 2-2 of Fig. 1, and indicating the plane upon which Fig. 1 is cut, by means of the line 1-1.

Fig. 3 is a fragmentary top plan view with parts broken away and in horizontal section.

Fig. 4 is a perspective view showing several of the screening bars and the shaft on which they are mounted.

Fig. 5 is a view similar to Fig. 4:, illustrating a different form of screening bar.

The numeral 1 of the drawings designates an open rectangular frame which is suitably inclined for use as indicated in Fig. 1 and may be held at any adequate inclinatlon by means of any suitable char- Specification of Letters Patent.

Patented Mar. 23, 1920.

Application filed February 13, 1919. Serial No. 276,809.

acter. The side bars 2 of the frame 1 are provided in their inner sides with longitudinal grooves 3, and. with sockets 4. opening into the lower sides of the grooves. Spaced, transverse screen supporting mem bers 5 extend between the side bars 2 and each of said members includes a preferably rectangular shaft 6, the ends of the several shafts being non-rotatably received in the sockets l, being normally held in said sockets by longitudinal plates 7 which are secured by screws or the like 8 to the inner sides of the bars 2, the lower edges of said plates being disposed in the upward paths of the shafts 6 as shown. These plates not only perform the function of securing the supporting members 5 in the sockets 41, but they serve also to protect the sides of the frame against cutting and wear from the material being screened. hen the plates in question are removed, the shafts 6 are movable upwardly into the grooves 3 and may be moved along the latter until entirely clear of the frame.

Each shaft 6 carries a series of longitudinal screening bars 9 and 9, the bars 9 being interposed between the bars 9. The bars of each series are parallel when viewed from top or bottom, as will be seen from Fig. 3, but the bars 9 diverge with the bars 9,toward their free ends, said ends being located over the next adjacent supporting member 5 and resting on a longitudinal rib 10 with which such member is equipped. The free ends of the bars 9-" are in a plane above the corresponding ends of the bars 9, and are bent or otherwise turned downwardly at 11 for contact with the ribs 10.

The bars 9 and 9 are provided with rectangular eyes 12 which snugly receive the shafts 6 and may be spaced apart on the latter by collars 13.

Angular bars 1lextend longitudinally of the shafts 6 and receive the eyes 19.,in

their angles, one edge of said bars being provided with ears 15 extending laterally and provided with openings through which certain of the bars 9 pass, whereby to anchor this edge of the aforesaid angular bars, the other edge thereof being secured to the eyes at 16, by soldering or in any other pre ferred manner. By providing the bars 14- extending along two sides of the eyes 19., the latter are effectively held against any loose movement upon the shafts 6 and whenever a broken bar 9 or SF is to be replaced, meltthe repairs and replacing is provided, in which ing of the solder 16 or releasing any other attaching means with which the bars 14 may be provided, will permit removal of such bars, so that the eyes 12 of the bars 9 and 9 may be removed as required to give access to the damaged bar. After making the removed parts, the bar 14 is again secured in place.

In addition to the function above assigned to the bars 1d, they serve as carrying means for the ribs 10 and the bars in question may well be stamped from sheet metal, with their corners so stamped as to form said ribs along the same; The shafts 6, bars l l, and ribs 10 constitute the supporting members 5 above referred to and since the principal otlice of thesupporting members is to carry the bars 9 and 9i and to support the free ends of said bars, it will be clear that their shape and construction might vary in numerous ways, although the arrangement disclosed may well be followed.

Fig. 5 discloses a slightly different form of the invention in which straight bars 9 are used between the bars 9, instead of the bars 9 with their downwardly bent front ends. The screen is )referably constructed as first described. for eavy work, but when light grades of material are to be screened, the bars 9* may be employed and their free ends will require no support.

By the construction and arrangement of parts above described, a very eflicient screen gradually increasing spacesare provided'between the screening bars, without decreasing the size of such bars from one end to the other, this being obtainedby the vertical divergence of alternate bars with those intervening. The bars let withtheir ribs 10, space the lower ends of each series of screening bars above the next adjacent series, so that the material, in sliding from one section to another, will nee-- essarily drop to such an extent as to thoroughly break apart any granules or the like I which may have-adhered to each other. The

novel manner of securing the supporting members 5 1n place is also a rather 1mport'ant feature of the invention, since the "plates have the twofold function of pre- Venting upward movement of said members and protecting the side bars of the frame against the actionof the ore, gravehsand,

j etc., being screened.

In operation, the device is suitably inclined as in F ig. 1, and the material is thrown upon the uppermost screening bars, down which itslides, the finer particles falling through the spaces between the bars while the coarser material drops onto the next series of bars and is subjected to the action W thereof, the dropping of the nnderial serving to jar loose any portions thereof which may have adhered to each other. By providing the gradually increasing spaces between the screening bars, there is no possibility of the screen becoming clogged and under each section of the screen, the material will be graded according to the incr msing size of such spaces.

The invention is of comparatively simple nature, may be constructed and sold at small cost, and will be of great advantage for screening numerous kinds of material. Since good results may be obtained from the features disclosed, they ma well be followed, but within the scope of the invention as claimed, numerous changes may well be made.

I claim:

1. A screen comprising a frame. and screening means in said frame composed of longitudinal bars, the alternate ones of which diverge vertically from the others substantially throughout their length, all of. said bars being of uniform cross section from one end to the other.

2. In a screen, a frame, a plurality of transverse supporting members mounted in said frame, longitudinal screening bars disposed in transverse series within said frame. said bars being secured at one end to said supporting members with the bars of each series extending over the next adjacent supporting member, adjacent bars of each series diverging vertically from their fixed to their free ends and the uppermost of said free ends being turned downwardly and resting 011 said supporting members, the free ends of the other bars also resting on said supporting members.

3. In a screen, a frame, a transverse shaft extending across said frame, longitudinal screening bars having eyes on one end nonrotatably receiving said shaft, an angular bar extending longitudinally of said shaft and receiving said eyes snugly in its angle, and lateral ears on one edge of said angular bar through which certain of said screening bars project to anchor said har edge, the other edge of said angular bar being secured to said eyes.

4. A structure as specified in claim 3, said angular bar beingstamped from metal and the corner of said bar being stamped to HERMAN F. WULLSTEIN.

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